122912021 has 4 divisors (see below), whose sum is σ = 123999852. Its totient is φ = 121824192.

The previous prime is 122911991. The next prime is 122912029. The reversal of 122912021 is 120219221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16924996 + 105987025 = 4114^2 + 10295^2 .

It is a cyclic number.

It is not a de Polignac number, because 122912021 - 2¹⁴ = 122895637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 122911984 and 122912002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122912029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 543746 + ... + 543971.

It is an arithmetic number, because the mean of its divisors is an integer number (30999963).

Almost surely, 2^122912021 is an apocalyptic number.

It is an amenable number.

122912021 is a deficient number, since it is larger than the sum of its proper divisors (1087831).

122912021 is a wasteful number, since it uses less digits than its factorization.

122912021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1087830.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 122912021 is about 11086.5693972482. The cubic root of 122912021 is about 497.2003815302.

The spelling of 122912021 in words is "one hundred twenty-two million, nine hundred twelve thousand, twenty-one".